Puzzle Lab / Invariants and parity / Challenge Board2 objects

Puzzle Lab / logic

Invariants and parity

Small problems where the answer becomes obvious after the right conserved quantity appears.

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Puzzle Lab / Logic Puzzles / Puzzles The Blindfolded Cards
You cannot see the cards. You still need to make two piles with equal face-up cards.
Beginner 5 min Evergreen Logic Puzzles
Puzzle Lab / Logic Puzzles / Puzzles The Parity Party Switches
Some operations change many things, but one parity fact stays fixed.
Beginner 7 min Active Logic Puzzles